package net.myvietnam.mvncore.configuration;

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 *    any, must include the following acknowledgement:
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 * ====================================================================
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 */

import java.io.IOException;

import org.xml.sax.SAXException;

/**
 * <p>A specialized SAX2 XML parser that processes configuration objects.</p>
 * <p>This class mimics to be a SAX compliant XML parser. It is able to iterate
 * over the keys in a configuration object and to generate corresponding SAX
 * events. By registering a <code>ContentHandler</code> at an instance
 * it is possible to perform XML processing on a configuration object.</p>
 *
 * @author <a href="mailto:oliver.heger@t-online.de">Oliver Heger</a>
 * @version $Id: BaseConfigurationXMLReader.java,v 1.2 2010/07/19 07:37:27 minhnn Exp $
 */
public class BaseConfigurationXMLReader extends ConfigurationXMLReader
{
    /** Stores the actual configuration.*/
    private Configuration config;

    /**
     * Creates a new instance of <code>BaseConfigurationXMLReader</code>.
     */
    public BaseConfigurationXMLReader()
    {
        super();
    }

    /**
     * Creates a new instance of <code>BaseConfigurationXMLReader</code> and
     * sets the configuration object to be parsed.
     * @param conf the configuration to be parsed
     */
    public BaseConfigurationXMLReader(Configuration conf)
    {
        this();
        setConfiguration(conf);
    }

    /**
     * Returns the actual configuration to be processed.
     * @return the actual configuration
     */
    public Configuration getConfiguration()
    {
        return config;
    }

    /**
     * Sets the configuration to be processed.
     * @param conf the configuration
     */
    public void setConfiguration(Configuration conf)
    {
        config = conf;
    }

    /**
     * Returns the configuration to be processed.
     * @return the actual configuration
     */
    public Configuration getParsedConfiguration()
    {
        return getConfiguration();
    }

    /**
     * The main SAX event generation method. This element uses an internal
     * <code>HierarchicalConfigurationConverter</code> object to iterate over
     * all keys in the actual configuration and to generate corresponding SAX
     * events.
     * @throws IOException if no configuration object is specified
     * @throws SAXException if a SAXException occurs during parsing
     */
    protected void processKeys() throws IOException, SAXException
    {
        fireElementStart(getRootName(), null);
        new SAXConverter().process(getConfiguration());
        fireElementEnd(getRootName());
    }

    /**
     * An internally used helper class to iterate over all configuration keys
     * ant to generate corresponding SAX events.
     *
     * @author <a href="mailto:oliver.heger@t-online.de">Oliver Heger</a>
     */
    class SAXConverter extends HierarchicalConfigurationConverter
    {
        /**
         * Callback for the start of an element.
         * @param name the element name
         * @param value the element value
         */
        protected void elementStart(String name, Object value)
        {
            fireElementStart(name, null);
            if (value != null)
            {
                fireCharacters(value.toString());
            }  /* if */
        }

        /**
         * Callback for the end of an element.
         * @param name the element name
         */
        protected void elementEnd(String name)
        {
            fireElementEnd(name);
        }
    }
}
